Thermoregulation is the process by which animals maintain an internal temperature within a tolerable range. Most all chemical and physiological processes are very sensitive to change in body temperature, therefore, thermoregulation is crucial to animals. Every species has their own optimal temperature range.
Endothermy
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Ectothermy
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Ectothermy and Edothermy are not mutually exclusive; an endothermic animal may warm itself by the sun or cool itself with water, for instance.